Ventilator.



Patented Nov. 28, |899. J. A. GAVIN.

VENTILAT'QR. A pliegue; med Mar. 17, 1899) UNITED STATES PATENT OFFICE.

JOHN A. GAVIN, OF ROCK ISLAND, ILLINOIS.

VENTILATO R.

SPECIFICATION forming part of Letters Patent No. 637,863, dated November 28, 1899.

Application tiled March 17, 1899.

T0 all whom t may concern:

Be it known than I, JOHN A. GAVIN, a resident of Rock Island, in the county of Rock Island and State of Illinois, have invented certain new and useful Improvements in Ventilators; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others tion, cheap to manufacture, neat in appearance, and most effectual when in use.

With these objects in view the invention consists in certain novel features of construction and combinations and arrangements of parts, as will be more fully hereinafter described, and pointed out inthe claims.

In the accompanying drawings, Figure l is a top view illustrating my improvements. Fig. 2 is a view in section of same. Fig. 3 is a view on the line a; of Fig. 2, and Fig. et is a View of a modified form of my invention.

A represents a ring, made preferably of sheet metal, and within the lower portion of said ring a head or hood B is secured. In constructing the head or hood B, I prefer to take a strip or sheet of metal and slit the same at intervals, so as to form a series of six (more or less) arms l. The strip or sheet is then bent and the two ends secured together. The arms l are then bent inwardly,with their ends overlapping, and said overlapping ends are secured together. The upper part of the head orhood B is thus made with a series of at faces, the inner edges of which form an opening 2, and the outer edge of the hood is made angular in conformity with said fiat faces, while the lower part of said hood will be con- `ical in general form. The opening in the bottom of the hood (which alines with the opening 2) communicates with a pipe or stack 3, by which my improved device is connected Serial No. 709,518. (No model.)

with the apartment to be ventilated. The hood is secured to the ring A by means of bolts 3 and is spaced therefrom by washers 4. The angular form of the outer edge of the hood renders the space between the hood and ring quite large and ample for the free passage of air-currents,

A cap O is disposed over the hood B and secured to the ring A by means of suitable bolts 6, and Washers 7 are provided on said bolts to separate the cap from the ring. The cap O is made with a vertical angular portion 8 and a top inwardly and upwardly projecting portion 9. The vertical iiat portions 8 of the cap O are disposed in alinement with the angular outer edge of the hood B to permita free circulation of air. The cap O is provided at its top with an opening, over which an angular plate D, of glass or other transparent material, is placed, and an angular frame E is disposed around said glass plate. The frame E is made with an inwardly-projecting horizontal section ci, disposed on the edge of the glass, and a vertical portion b, which is secured at its lower edge to the cap, and said vertical portion b is provided with holes or openings c to permit the escape of moisture which might accumulate around the edge of the glass plate.

Instead of constructing my improved cap as above described I might employ such a cap as shown in Fig. 3. In this form of my invention the cap F is made approximately conical, having flat vertical angular side sec- ,tions d, as shown, and is provided on its upper end with a suitable ornamentation c, secured in place by bolts or rivets f.

Various other slight changes might be re sorted to in the general form and arrangement of the several parts described without departing from the spirit and scope of my in- Vention, and hence I would have it understood that I do not wish to limit myself to the precise details set forth, but consider myself at liberty to make such slight changes and alterations as fairly fall within the spirit and scope of my invention.

Having fully described my invention, what I claim as new, and desire to secure by Letters Patent, is

l. In a ventilator, the combination with a ring, of a hood secured therein and spaced IOO from the inner Wall thereof, the lower end of said hood being cylindrical for attachment of a ventilator-pipe and the outer edge of the flaring portion of said hood being angular horizontally, integral arms projecting upwardly and inwardly from said flaring edge,V

the ends of said arms overlapping and secured together.

2. A ventilator comprising a ring, a hood secured in the lower portion thereof and spaced therefrom, a cap secured in the upper portion of said ring and having an opening 

